Patent US3457048A successfully refreshed from Google Patents.
US3457048A
Expired / Lapsed
US
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Extractor
Assignee: Dow Chemical Co
•
Filing: 1966-08-05
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Granted: 1969-07-22
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Expires: 1986-08-05
Abstract
No abstract record available.
Inventors
- 👤 Bernard B Stephens
- 👤 Robert L Conder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:11
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; B01D11/0207; B01D11/0215; B01D11/0219; Y; Y10; Y10T; Y10T137/00; Y10T137/2713; Y10T137/2774
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US737625A
Cited
US1746525A
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US1942848A
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US2864396A
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US3284164A
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US3259462A
Cited
US3332744A
Cited
US3227312A
Cited
US3253740A
Cited
US3352267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |